The primary difference between the two is the crown thickness, the N/A unit having a crown 0.200” thick and the forced induction unit having a crown 0.240” thick. All forged pistons have the following features:

Superior near-net shape, tight grain aluminum forgings

Piston-to-Bore clearances similar to that of regular cast aluminum pistons

Fully balanced out of the box. Balance across set is better than +/- 1g.

Ultra flat, highly finished piston ring grooves

Exceptional manufacturing tolerances for all diameters and compression height

Radial Anti-Detonation Grooves (above 1st ring)

Pressure Accumulator Groove (between 1st & 2nd ring)

Pressure fed oiling of the wrist pin

All forged pistons available with the latest in anti-friction & ceramic heat barrier coatings.

Two choices of wrist pins, the standard item weighs 95g and the premium pin weighs 83g

Choosing your piston:

0.200" Crown
You should choose this piston if your engine is naturally aspirated or you don’t plan to run a high boost forced induction setup (10psi max). 13 grams less piston mass than 0.240” crown.

0.240" Crown
You should choose this piston if you’re running a high boost forced induction setup (up to 18psi). This is also the piston to choose if you’re concerned about any detonation occurring, as the thicker crown will prove more durable.